Can you please tell me how to make additional registration settings on a operator's SIP-switch.

My Yate registred on a switch, simulating the SIP-gateways, with a set of different accounts.According to the rules of this operator, one account at a time can make or receive only one connection.

Therefore, they require that lasts until the connection is established, our an account (which simulates the SIP-gateway) did not renew the SIP-registration. (Indeed, if it occurs, they SIP-switch breaks the existing telephone connection.)Further, they are less confident voice explains that this is because the re-registration during the call, in the "Contact" field indicates another TCP port, than in the standby mode.

So I have two questions:1. Can I customize Yate so that when the one connection is established an account did not renew the SIP-registration?2. Can I customize Yate so specified at SIP-registration port not changed?